Chuah, C.H. ’, K.H. Lee’, S.H. Goh, and S.H. Goh. 1999. “Alkaloids from Litsea Elliptibacea (Lauraccae)°”. Malaysian Journal of Science 18 (1):63-66. http://jummec.um.edu.my/index.php/MJS/article/view/9391.